Would also love to see this implemented.

Pleaseeee... it's only 2 extra settings that you probably know exactly where to put:

Width, with a slider, 0% - 100%
Position, either with a slider 0% - 100%, or 3 fixed settings left/center/right

For ultrawide monitors is really needed.

+1

This is a necessary feature addition in my opinion. It's really annoying having to look to the left all the time when using a ultrawide monitor. Implementation isn't that complicated. An additional one preference slider for the width in percent would be enough, align the terminal window to the center of the screen and thats it.

Regarding horizontal window resizing, do it like the "System Details" dialog in GNOME Settings in the "About" section, where the dialog window is still center aligned to the main window after risizing.

I will accept a pull request that implements this feature - but only if it wont break anything else.

I'm not going to work on this feature myself, at least in the foreseeable future.

@amezin I've taken an initial stab at this here #889

There's still a bit more work to do (tests, etc) but let me know what you think when you can please.